The Mouse Guard rules are unclear on whether -- during an extended conflict, a team's actions specifically address only a single other team on each phase of the turn. I think so, but not everyone in my group agrees.

Team Saxon's Attack is versus Team Snake's Maneuver. Since the Snake's roll was 5 and Team Saxon only rolled 3 successes, the Attack was unsuccessful, Snake didn't target Team Saxon so doesn't get to buy Maneuver effects against them.

Team Kenzie's Feint is Independent of Team Snake's Maneuver, so Team Kenzie's Obstacle is zero. The Feint removes 2 points from Team Snake's disposition.

Team Snake's Manuever is Independent of Team Kenzie's Feint, so Team Snake's Obstacle is zero. Team Snake has a margin of success of 5 with which to buy Maneuver effects against Team Kenzie.

If two teams have the same target and
choose actions that are both versus
their target's action, they must help
each other rather than roll.

With that in mind, I have to assume that your action only affects one enemy team. If the action affected all enemy teams, they wouldn't need the "two teams have the same target" clause because everyone would have the same targets.